WANG, L. ... et al., 2016. Modelling of Nb influence on phase transformation behaviours from austenite to ferrite in low carbon steels. Modelling and Simulation in Materials Science and Engineering, 24 (3), 035016
In this paper, a new model has been developed to predict the phase transformation
behaviours from austenite to ferrite in Nb-containing low carbon steels. The
new model is based on some previous work and incorporates the effects of
Nb on phase transformation behaviours, in order to make it applicable for
Nb-containing steels. Dissolved Nb atoms segregated at prior austenite grain
boundaries increase the critical energy for ferrite nucleation, and thus the
ferrite nucleation rate is decreased. Dissolved Nb atoms also apply a solute
drag effect to the moving transformation interface, and the ferrite grain growth
rate is also decreased. The overall transformation kinetics is then calculated
according to the classic Johnson–Mehl–Avrami–Kolmogorov (JMAK) theory.
The new model predictions are quite consistent with experimental results for
various steels during isothermal transformations or continuous cooling.
Closed access until 17/03/2017.
The authors gratefully thank Tata Steel UK Limited and Loughborough University for funding